Class DirectoryScanner
Class for scanning a directory for files/directories which match certain criteria.
These criteria consist of selectors and patterns which have been specified. With the selectors you can select which files you want to have included. Files which are not selected are excluded. With patterns you can include or exclude files based on their filename.
The idea is simple. A given directory is recursively scanned for all files and directories. Each file/directory is matched against a set of selectors, including special support for matching against filenames with include and and exclude patterns. Only files/directories which match at least one pattern of the include pattern list or other file selector, and don't match any pattern of the exclude pattern list or fail to match against a required selector will be placed in the list of files/directories found.
When no list of include patterns is supplied, "**" will be used, which means that everything will be matched. When no list of exclude patterns is supplied, an empty list is used, such that nothing will be excluded. When no selectors are supplied, none are applied.
The filename pattern matching is done as follows: The name to be matched is split up in path segments. A path segment
is the name of a directory or file, which is bounded by File.separator
('/' under UNIX, '\' under
Windows). For example, "abc/def/ghi/xyz.java" is split up in the segments "abc", "def","ghi" and "xyz.java". The same
is done for the pattern against which should be matched.
The segments of the name and the pattern are then matched against each other. When '**' is used for a path segment in the pattern, it matches zero or more path segments of the name.
There is a special case regarding the use of File.separator
s at the beginning of the pattern and the
string to match:
When a pattern starts with a File.separator
, the string to match must also start with a
File.separator
. When a pattern does not start with a File.separator
, the string to match
may not start with a File.separator
. When one of these rules is not obeyed, the string will not match.
When a name path segment is matched against a pattern path segment, the following special characters can be used:
'*' matches zero or more characters
'?' matches one character.
Examples:
- "**\*.class" matches all .class files/dirs in a directory tree.
- "test\a??.java" matches all files/dirs which start with an 'a', then two more characters and then ".java", in a directory called test.
- "**" matches everything in a directory tree.
- "**\test\**\XYZ*" matches all files/dirs which start with "XYZ" and where there is a parent directory called test (e.g. "abc\test\def\ghi\XYZ123").
Case sensitivity may be turned off if necessary. By default, it is turned on.
Example of usage:
String[] includes = { "**\\*.class" }; String[] excludes = { "modules\\*\\**" }; ds.setIncludes( includes ); ds.setExcludes( excludes ); ds.setBasedir( new File( "test" ) ); ds.setCaseSensitive( true ); ds.scan(); System.out.println( "FILES:" ); String[] files = ds.getIncludedFiles(); for ( int i = 0; i < files.length; i++ ) { System.out.println( files[i] ); }
This will scan a directory called test for .class files, but excludes all files in all proper subdirectories of a directory called "modules"
This class must not be used from multiple Threads concurrently!
- Author:
- Arnout J. Kuiper ajkuiper@wxs.nl, Magesh Umasankar, Bruce Atherton, Antoine Levy-Lambert
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Field Summary
Modifier and TypeFieldDescriptionstatic final String[]
Deprecated.Patterns which should be excluded by default. -
Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionvoid
Deprecated.Adds default exclusions to the current exclusions set.static DirectoryScanResult
Deprecated.diffIncludedFiles
(String... oldFiles) Deprecated.Determine the file differences between the currently included files and a previously captured list of files.Deprecated.Returns the base directory to be scanned.String[]
Deprecated.Returns the names of the directories which matched at least one of the include patterns and at least one of the exclude patterns.String[]
Deprecated.Returns the names of the files which matched at least one of the include patterns and at least one of the exclude patterns.String[]
Deprecated.this method is buggy.String[]
Deprecated.this method does not work correctly on Windows.String[]
Deprecated.Returns the names of the directories which matched none of the include patterns.String[]
Deprecated.Returns the names of the files which matched none of the include patterns.void
scan()
Deprecated.Scans the base directory for files which match at least one include pattern and don't match any exclude patterns.void
setBasedir
(File basedir) Deprecated.Sets the base directory to be scanned.void
setBasedir
(String basedir) Deprecated.Sets the base directory to be scanned.void
setCaseSensitive
(boolean isCaseSensitiveParameter) Deprecated.Sets whether or not the file system should be regarded as case sensitive.void
setExcludes
(String... excludes) Deprecated.Sets the list of exclude patterns to use.void
setFollowSymlinks
(boolean followSymlinks) Deprecated.Sets whether or not symbolic links should be followed.void
setIncludes
(String... includes) Deprecated.Sets the list of include patterns to use.void
setScanConductor
(ScanConductor scanConductor) Deprecated.
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Field Details
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DEFAULTEXCLUDES
Deprecated.Patterns which should be excluded by default.- See Also:
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Constructor Details
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DirectoryScanner
public DirectoryScanner()Deprecated.Sole constructor.
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Method Details
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setBasedir
Deprecated.Sets the base directory to be scanned. This is the directory which is scanned recursively. All '/' and '\' characters are replaced byFile.separatorChar
, so the separator used need not matchFile.separatorChar
.- Parameters:
basedir
- The base directory to scan. Must not benull
.
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setBasedir
Deprecated.Sets the base directory to be scanned. This is the directory which is scanned recursively.- Parameters:
basedir
- The base directory for scanning. Should not benull
.
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getBasedir
Deprecated.Returns the base directory to be scanned. This is the directory which is scanned recursively.- Returns:
- the base directory to be scanned
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setCaseSensitive
public void setCaseSensitive(boolean isCaseSensitiveParameter) Deprecated.Sets whether or not the file system should be regarded as case sensitive.- Parameters:
isCaseSensitiveParameter
- whether or not the file system should be regarded as a case sensitive one
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setFollowSymlinks
public void setFollowSymlinks(boolean followSymlinks) Deprecated.Sets whether or not symbolic links should be followed.- Parameters:
followSymlinks
- whether or not symbolic links should be followed
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setIncludes
Deprecated.Sets the list of include patterns to use. All '/' and '\' characters are replaced byFile.separatorChar
, so the separator used need not matchFile.separatorChar
.When a pattern ends with a '/' or '\', "**" is appended.
- Parameters:
includes
- A list of include patterns. May benull
, indicating that all files should be included. If a non-null
list is given, all elements must be non-null
.
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setExcludes
Deprecated.Sets the list of exclude patterns to use. All '/' and '\' characters are replaced byFile.separatorChar
, so the separator used need not matchFile.separatorChar
.When a pattern ends with a '/' or '\', "**" is appended.
- Parameters:
excludes
- A list of exclude patterns. May benull
, indicating that no files should be excluded. If a non-null
list is given, all elements must be non-null
.
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scan
Deprecated.Scans the base directory for files which match at least one include pattern and don't match any exclude patterns. If there are selectors then the files must pass muster there, as well.- Throws:
IllegalStateException
- if the base directory was set incorrectly (i.e. if it isnull
, doesn't exist, or isn't a directory).
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diffIncludedFiles
Deprecated.Determine the file differences between the currently included files and a previously captured list of files. This method will not look for a changed in content but sole in the list of files given.The method will compare the given array of file Strings with the result of the last directory scan. It will execute a
scan()
if no result of a previous scan could be found.The result of the diff can be queried by the methods
DirectoryScanResult.getFilesAdded()
andDirectoryScanResult.getFilesRemoved()
- Parameters:
oldFiles
- the list of previously captured files names.- Returns:
- the result of the directory scan.
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diffFiles
public static DirectoryScanResult diffFiles(@Nullable String[] oldFiles, @Nullable String[] newFiles) Deprecated.- Parameters:
oldFiles
- array of old filesnewFiles
- array of new files- Returns:
- calculated difference
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getIncludedFiles
Deprecated.this method does not work correctly on Windows.Returns the names of the files which matched at least one of the include patterns and none of the exclude patterns. The names are relative to the base directory.- Returns:
- the names of the files which matched at least one of the include patterns and none of the exclude patterns. May also contain symbolic links to files.
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getNotIncludedFiles
Deprecated.Returns the names of the files which matched none of the include patterns. The names are relative to the base directory. This involves performing a slow scan if one has not already been completed.- Returns:
- the names of the files which matched none of the include patterns.
- See Also:
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getExcludedFiles
Deprecated.Returns the names of the files which matched at least one of the include patterns and at least one of the exclude patterns. The names are relative to the base directory. This involves performing a slow scan if one has not already been completed.- Returns:
- the names of the files which matched at least one of the include patterns and at at least one of the exclude patterns.
- See Also:
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getIncludedDirectories
Deprecated.this method is buggy. Do not depend on it.Returns the names of the directories which matched at least one of the include patterns and none of the exclude patterns. The names are relative to the base directory.- Returns:
- the names of the directories which matched at least one of the include patterns and none of the exclude patterns. May also contain symbolic links to directories.
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getNotIncludedDirectories
Deprecated.Returns the names of the directories which matched none of the include patterns. The names are relative to the base directory. This involves performing a slow scan if one has not already been completed.- Returns:
- the names of the directories which matched none of the include patterns.
- See Also:
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getExcludedDirectories
Deprecated.Returns the names of the directories which matched at least one of the include patterns and at least one of the exclude patterns. The names are relative to the base directory. This involves performing a slow scan if one has not already been completed.- Returns:
- the names of the directories which matched at least one of the include patterns and at least one of the exclude patterns.
- See Also:
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addDefaultExcludes
public void addDefaultExcludes()Deprecated.Adds default exclusions to the current exclusions set.
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java.nio.file.DirectoryStream
orjava.nio.Files.walkFileTree()
and related classes